Search found 93 matches

by GigaBecquerel
18 Jan 2021, 04:01
Forum: Detectors
Topic: Reflectors in scintillators
Replies: 1
Views: 9

Reflectors in scintillators

Hello! I have an old russian 63x63 mm NaI scintillator with a few yellow spots, and I will soon get access to a dry air glovebox. So I would like to try to repair it with a mix of washing and polishing it (https://doi.org/10.1016/0168-9002(87)90900-4). It gives readable spectra, but all the peaks ha...
by GigaBecquerel
16 Jan 2021, 06:47
Forum: Trading post
Topic: 14 pin PMT Divider Base
Replies: 0
Views: 22

14 pin PMT Divider Base

Hello! I am selling two 14 pin PMT bases, one with 10 MOhm per dynode, and one with 1 MOhm per dynode, both for positive high voltage. They fit pretty much any 14 pin PMT with the "standard" pinout, but not others like the R6231. Screenshot from 2021-01-15 20-42-19.png photo_2021-01-15_20-39-39.jpg ...
by GigaBecquerel
16 Jan 2021, 03:20
Forum: Detectors
Topic: SrI2(Eu) detectors
Replies: 13
Views: 631

Re: SrI2(Eu) detectors

Ah, I understand! I am not sure if you can achieve the best possible resolution with LaBr and a Soundcard, as it really wants a short time constant of ~300 to 500 ns. Have you tried Becqmoni? That's where I got my best results with the HPGe. Also, try disabling the IIR filter in theremino, as it jus...
by GigaBecquerel
15 Jan 2021, 20:23
Forum: Detectors
Topic: SrI2(Eu) detectors
Replies: 13
Views: 631

Re: SrI2(Eu) detectors

Looks like you have quite the detector collection! I still need to add SrI and CZT to mine.
The resolution of your LaBr looks a bit low, the two peaks around ~950 keV should go down to the baseline.
What time constant and PMT did you use with that one?
by GigaBecquerel
11 Jan 2021, 20:28
Forum: Spectrum
Topic: Cs137 in biomass pelletized wood ash
Replies: 7
Views: 155

Re: Cs137 in biomass pelletized wood ash

Wow, that's an impressive amount of contamination!
I never would have guessed that it surpasses the k40 peak.
by GigaBecquerel
01 Jan 2021, 11:28
Forum: Detectors
Topic: Making your own plastic scintillators
Replies: 9
Views: 327

Re: Making your own plastic scintillators

Hello Steven,

You can use pretty much any resin, the more aromatic rings the better.
PET and PEN are intrinsic scintillators as well!

Lukas
by GigaBecquerel
28 Dec 2020, 23:45
Forum: Detectors
Topic: Making your own plastic scintillators
Replies: 9
Views: 327

Re: Making your own plastic scintillators

And if you buy all of that you could also try making scintillators with it ;-)
by GigaBecquerel
28 Dec 2020, 20:40
Forum: Detectors
Topic: Making your own plastic scintillators
Replies: 9
Views: 327

Re: Making your own plastic scintillators

I have now confirmed that they are alpha sensitive, albeit not by much. The biggest pulse height is caused by betas, unsurprisingly, but gamma is not that much smaller, I guess that's because the scintillator is big enough to actually absorb most of the gammas. Am241 alphas give about 1/10 the pulse...
by GigaBecquerel
26 Dec 2020, 08:56
Forum: Detectors
Topic: Making your own plastic scintillators
Replies: 9
Views: 327

Re: Making your own plastic scintillators

Hi Luuk, Thank you for the kind words! I hope many people will try it, as it can be made so much better and become actually useful! Imagine building your own cosmic watch, but for a fraction of the price and as big as you want, and that's just one of many, many applications. I will definitely also t...